辽西地区冻风积土动力特性试验分析
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摘要
动荷载作用下冻土的动力学参数是寒区工程抗震设计的关键。基于大量室内动三轴试验,研究了地震荷载作用下,辽西冻风积土的动强度σd、动变形εd、动弹性模量Ed和动阻尼比λd等动力学参数与土体含水量w、温度T、围压σ3c、动应力幅值σdamx和频率f等条件的关系。试验中采用三水平六因素的设计方法共进行了18组试验。试验结果表明,在相同振次水平条件下,冻土的动变形随动应力幅值的增大和温度上升而增大;在相同温度条件下,冻土的动剪切强度τd随着围压的增加而增加;低温冻土(-15℃)的动强度和动弹性模量要高于高温冻土(-2℃)的动强度和动弹性模量;冻土的动阻尼比随着变形和频率的增加而降低,随着含水量的增加而增加。上述规律为辽西风积土地区建设工程提供了较为可靠的抗震设计依据。
Dynamic parameters of frozen soil are the key of the aseismatic design in frost zone.Basing on a lot of in-situ dynamic triaxial tests,the paper research the relationship of dynamic stress,dynamic strain,dynamic modulus of elasticity and damping ratio to the moisture content,temperature,confining pressure,dynamic stress level and frequency of frozen aeolian soil in west of Liaoning Province under earthquake load.18 group of tests were conducted by adopt three level six factors design method.The tests results show that with dynamic stress amplitude increase and temperature rise,the dynamic deformation will increasing in the same level of vibration numbers;Dynamic shear strength increasing with confining pressure increasing in the same temperature;The dynamic stress and dynamic modulus of elasticity of low-temperature frozen soil are superior than high-temperature frozen soil.The dynamic damping ratio decrease with deformation and frequency increasing,increasing with moisture content increasing.The results provide reliable aseismic design references to construction engineering in frozen aeolian soil area.
Dynamic parameters of frozen soil are the key of the aseismatic design in frost zone.Basing on a lot of in-situ dynamic triaxial tests,the paper research the relationship of dynamic stress,dynamic strain,dynamic modulus of elasticity and damping ratio to the moisture content,temperature,confining pressure,dynamic stress level and frequency of frozen aeolian soil in west of Liaoning Province under earthquake load.18 group of tests were conducted by adopt three level six factors design method.The tests results show that with dynamic stress amplitude increase and temperature rise,the dynamic deformation will increasing in the same level of vibration numbers;Dynamic shear strength increasing with confining pressure increasing in the same temperature;The dynamic stress and dynamic modulus of elasticity of low-temperature frozen soil are superior than high-temperature frozen soil.The dynamic damping ratio decrease with deformation and frequency increasing,increasing with moisture content increasing.The results provide reliable aseismic design references to construction engineering in frozen aeolian soil area.
引文
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[12]赵淑萍,朱元林,何平,等.冻土动力学参数测试研究[J].岩石力学与工程学报,2003,22(S2):2677-2681.ZHAO Shuping,ZHU Yuanlin,He Ping,etc.Testingstudy on dynamic mechanics parameters of frozen soil[J].Chinese Journal of Rock Mechanics andEngineering,2003,22(s2):2677-2681.
[13]李栋伟,汪仁和.冻土抗剪强度特性及试验研究[J].安徽理工大学学报(自然科学版),2004,24(S):52-55.LI Dongwei,WANG Renhe.Frozen soil ant-shearstrength character and testing study[J].Journal of An’hui University of Science and Technology(NaturalScience),2004,24(S):52-55.
[14]MoonYoung Kim,HeeTaek Yun,Nam-ⅡKim.Exactdynamic and static element stiffness matrices of non-symmetric thin-walled beam-columns.Computers andStructures,2003,81:1425-1448.
[15]周幼吾,郭东信,邱国庆,等.中国冻土[M].北京:科学出版社,2000.ZHOU Youwu,GUO Dongxin,QIU Guoqing,et al.Physics of Chinese permafrost[M].Beijing:SciencePress,2000.
[16]Seed H B,Idriss I M.Simplified procedure for evaluationsoil liquefaction potential[J].Soil Mech.Found Div,ASCE,1971,97(SM9):1249-1273.
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[2]ZHANG T,Barry R G,Knowles K,et al.Statistics andcharacteristics of permafrost and ground ice distribution inthe Northern Hemisphere[J].Polar Geography,1999,23(2):147-169.
[3]吴志坚,王兰民,马巍,等.地震荷载作用下冻土的动力学参数试验研究[J].西北地震学报,2003,25(3):210-214.WU Zhijian,WANG Lanmin,MA Wei,et al.Laboratorystudy on dynamics parameters of frozen soil under seismicdynamic loading[J].Northwestern SeismologicalJournal,2003,25(3):210-214.
[4]吴志坚,马巍,王兰民,等.地震荷载作用下温度和围压对冻土强度影响的试验研究[J].冰川冻土,2003,25(6):648-652.WU Zhijian,MA Wei,WANG Lanmin,et al.Laboratorystudy on the effect of temperature and confining pressureon strength of frozen soil under seismic dynamic loading[J].Journal of Glaciology and Geocryology,2003,25(6):648-652.
[5]朱占元,凌贤长,胡庆立,等.动力荷载长期作用下冻土振陷模型试验研究[J].岩土力学,2009,30(4):955-959.ZHU Zhanyuan,LING Xianzhang,HU Qingli,et al.Experimental research of vibration excited subsidence offrozen soil under long-term dynamic loads[J].Rock andSoil Mechanics,2009,30(4):955-959.
[6]朱占元,凌贤长,胡庆立,等.中国青藏铁路北麓河路基冻土动应变速率试验研究[J].岩土工程学报,2007,29(10):1439-1445.ZHU Zhanyuan,LING Xianzhang,HU Qingli,et al.Experimental Study on Dynamic Strain Rate of Frozen Soilfrom Railway Embankment of Qinghai-Tibet Railway inChina[J].Chinese Journal of Geotechnical Engineering,2007,29(10):1439-1445.
[7]朱占元,李静,邹祖银,等.动力荷载作用下冻土变形特性研究[J].低温建筑技术,2008,2:112-114.ZHU Zhanyuan,LI Jing,ZOU Zuyin,et al.study ondeformation characters of frozen soil under long termdynamic loading[J].Low Temperature ArchitectureTechnology,2008,2:112-114.
[8]王丽霞,凌贤长,徐学燕,等.多年冻土场地路基地震加速度反应谱特性研究[J].岩石力学与工程学报,2004,23(8):1330-1335.WANG Lixia,LING Xianchang,XU Xueyan,et al.Studyon response spectrum characteristics of earthquakeacceleration for roadbed on permafrost site[J].ChineseJournal of Rock Mechanics and Engineering,2004,23(8):1330-l335.
[9]吴志坚,孙军杰,王兰民,等.青藏铁路沿线冻土场地地震动特征研究[J].岩石力学与工程学报,2007,26(12):2466-2472.WU Zhijia,SUN Junjie,WANG Lanmin,et al.study oncharacteristics of ground motion at permafrost sites alongqinghai-tibet railway[J].Chinese Journal of RockMechanics and Engineering,2007,26(12):2466-2472.
[10]沈忠言,张家懿.冻结粉土的动强度特性及其破坏准则[J].冰川冻土,1997,19(2):141-148.SHEN Zhongyan,ZHANG Jiayi.Dynamic strengthcharacteristics and failure criterion of frozen silt[J].Journal of Glaciology And Geocryology,1997,19(2):141-148.
[11]张淑娟,赖远明,李双洋,等.冻土动强度特性试验研究[J].岩土工程学报,2008,30(4):595-599.ZHANG Shujuan,LAI Yuanming,LI Shuangyang,et al.Dynamic strength of frozen soil[J].Chinese Journal ofGeotechnical Engineering,2008,30(4):595-599.
[12]赵淑萍,朱元林,何平,等.冻土动力学参数测试研究[J].岩石力学与工程学报,2003,22(S2):2677-2681.ZHAO Shuping,ZHU Yuanlin,He Ping,etc.Testingstudy on dynamic mechanics parameters of frozen soil[J].Chinese Journal of Rock Mechanics andEngineering,2003,22(s2):2677-2681.
[13]李栋伟,汪仁和.冻土抗剪强度特性及试验研究[J].安徽理工大学学报(自然科学版),2004,24(S):52-55.LI Dongwei,WANG Renhe.Frozen soil ant-shearstrength character and testing study[J].Journal of An’hui University of Science and Technology(NaturalScience),2004,24(S):52-55.
[14]MoonYoung Kim,HeeTaek Yun,Nam-ⅡKim.Exactdynamic and static element stiffness matrices of non-symmetric thin-walled beam-columns.Computers andStructures,2003,81:1425-1448.
[15]周幼吾,郭东信,邱国庆,等.中国冻土[M].北京:科学出版社,2000.ZHOU Youwu,GUO Dongxin,QIU Guoqing,et al.Physics of Chinese permafrost[M].Beijing:SciencePress,2000.
[16]Seed H B,Idriss I M.Simplified procedure for evaluationsoil liquefaction potential[J].Soil Mech.Found Div,ASCE,1971,97(SM9):1249-1273.
[17]谢定义.土动力学[M].西安:西安交通大学出版社,1988.XIE Dingyi.Soil dynamics[M].Xi’an:Xi’an JiaotonUniversity Press,1988.
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